Six people have been shot and injured after a gunman opened fire inside a FedEx centre in Georgia before allegedly shooting himself, police have said.
The gunman was reported at the ground facility in Kennesaw, Georgia, about 30 miles northwest of Atlanta, at 6am EST, Cobb County Police spokesman Mike Bowman said.
The suspect has not yet been identified by police. He was found dead with an apparently self-inflicted gunshot wound.
Two of the injured are in a critical condition and four others are being treated for less serious injuries at the WellStar Kennestone Hospital in Marietta.
FedEx employee Liza Aiken told the Atlanta Journal-Constitution that she was correcting addresses on packages when she saw a man dressed all in black and armed with a knife, assault rifle and a cartridge belt strapped across this chest.
"He looked like he was heading into war," she told the newspaper. "As soon as I saw him, I ran the other way."
A FedEx spokeswoman extended condolences to those affected by the shooting.
"The situation is now stabilised, and we are focused on the needs of our team members and cooperating with the law enforcement investigation of this tragedy," said company spokeswoman Shea Leordeanu.
Hundreds of police from multiple agencies had converged on the scene. Mr Bowman said the area around the building had been secured, and officers were clearing the incident location.
"This is still an active and fluid situation," he said in a statement.